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term: allow horizontal movements outside scrolling region
[fbpad.git] / term.c
blob08355d6054f26dcd93818f3bed15db7d25b11bcb
1 #include <ctype.h>
2 #include <errno.h>
3 #include <fcntl.h>
4 #include <poll.h>
5 #include <stdlib.h>
6 #include <stdio.h>
7 #include <string.h>
8 #include <sys/types.h>
9 #include <sys/ioctl.h>
10 #include <termios.h>
11 #include <unistd.h>
12 #include "config.h"
13 #include "pad.h"
14 #include "util.h"
15 #include "term.h"
16
17 #define MODE_CURSOR 0x01
18 #define MODE_WRAP 0x02
19 #define MODE_ORIGIN 0x04
20 #define MODE_AUTOCR 0x08
21 #define MODE_DEFAULT (MODE_CURSOR | MODE_WRAP)
22 #define ATTR_BOLD 0x10
23 #define ATTR_REV 0x20
24 #define ATTR_ALL (ATTR_BOLD | ATTR_REV)
25 #define MODE_INSERT 0x40
26 #define MODE_WRAPREADY 0x80
27
28 #define BIT_SET(i, b, val) ((val) ? ((i) | (b)) : ((i) & ~(b)))
29 #define OFFSET(r, c) ((r) * pad_cols() + (c))
30
31 static struct term *term;
32 static int *screen;
33 static char *fgs, *bgs;
34 static int row, col;
35 static char fg, bg;
36 static int top, bot;
37 static int mode;
38 static int visible;
39
40 /* low level drawing and lazy updating */
41
42 #define MAXLINES (1 << 8)
43 static int dirty[MAXLINES];
44 static int lazy;
45
46 static char fgcolor(void)
47 {
48 int c = mode & ATTR_REV ? bg : fg;
49 return mode & ATTR_BOLD ? c | 0x08 : c;
50 }
51
52 static char bgcolor(void)
53 {
54 return mode & ATTR_REV ? fg : bg;
55 }
56
57 static void _draw_pos(int r, int c, int cursor)
58 {
59 int rev = cursor && mode & MODE_CURSOR;
60 int i = OFFSET(r, c);
61 char fg = rev ? bgs[i] : fgs[i];
62 char bg = rev ? fgs[i] : bgs[i];
63 if (visible)
64 pad_put(screen[i], r, c, fg, bg);
65 }
66
67 static void _draw_row(int r)
68 {
69 int i;
70 pad_blankrow(r, bgcolor());
71 for (i = 0; i < pad_cols(); i++) {
72 int c = screen[OFFSET(r, i)];
73 if ((c && c != ' ') || bgs[OFFSET(r, i)] != bgcolor())
74 _draw_pos(r, i, 0);
75 }
76 }
77
78 static int candraw(int sr, int er)
79 {
80 int i;
81 if (visible && !lazy)
82 return 1;
83 if (lazy)
84 for (i = sr; i < er; i++)
85 dirty[i] = 1;
86 return 0;
87 }
88
89 static void draw_rows(int sr, int er)
90 {
91 int i;
92 if (candraw(sr, er))
93 for (i = sr; i < er; i++)
94 _draw_row(i);
95 }
96
97 static void draw_cols(int r, int sc, int ec)
98 {
99 int i;
100 if (candraw(r, r + 1))
101 for (i = sc; i < ec; i++)
102 _draw_pos(r, i, 0);
103 }
104
105 static void draw_char(int ch, int r, int c)
106 {
107 int i = OFFSET(r, c);
108 screen[i] = ch;
109 fgs[i] = fgcolor();
110 bgs[i] = bgcolor();
111 if (candraw(r, r + 1))
112 _draw_pos(r, c, 0);
113 }
114
115 static void draw_cursor(int put)
116 {
117 if (candraw(row, row + 1))
118 _draw_pos(row, col, put);
119 }
120
121 static void lazy_start(void)
122 {
123 memset(dirty, 0, sizeof(dirty));
124 lazy = 1;
125 }
126
127 static void lazy_flush(void)
128 {
129 int i;
130 if (!visible)
131 return;
132 _draw_pos(row, col, 0);
133 for (i = 0; i < pad_rows(); i++)
134 if (dirty[i])
135 _draw_row(i);
136 _draw_pos(row, col, 1);
137 }
138
139 static void screen_reset(int i, int n)
140 {
141 memset(screen + i, 0, n * sizeof(*screen));
142 memset(fgs + i, fg, n);
143 memset(bgs + i, bg, n);
144 }
145
146 static void screen_move(int dst, int src, int n)
147 {
148 memmove(screen + dst, screen + src, n * sizeof(*screen));
149 memmove(fgs + dst, fgs + src, n);
150 memmove(bgs + dst, bgs + src, n);
151 }
152
153 /* terminal input buffering */
154
155 #define PTYBUFSIZE (1 << 13)
156
157 static char ptybuf[PTYBUFSIZE]; /* always emptied in term_read() */
158 static int ptylen; /* buffer length */
159 static int ptycur; /* current offset */
160
161 static void waitpty(void)
162 {
163 struct pollfd ufds[1];
164 ufds[0].fd = term->fd;
165 ufds[0].events = POLLIN;
166 poll(ufds, 1, 100);
167 }
168
169 static int readpty(void)
170 {
171 if (ptycur < ptylen)
172 return ptybuf[ptycur++];
173 if (!term->fd)
174 return -1;
175 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
176 if (ptylen == -1 && errno == EAGAIN) {
177 waitpty();
178 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
179 }
180 if (ptylen > 0) {
181 ptycur = 1;
182 return ptybuf[0];
183 }
184 return -1;
185 }
186
187 /* term interface functions */
188
189 void term_send(int c)
190 {
191 char b = c;
192 if (term->fd)
193 write(term->fd, &b, 1);
194 }
195
196 static void term_sendstr(char *s)
197 {
198 if (term->fd)
199 write(term->fd, s, strlen(s));
200 }
201
202 static void term_blank(void)
203 {
204 screen_reset(0, pad_rows() * pad_cols());
205 if (visible)
206 pad_blank(bgcolor());
207 }
208
209 static void ctlseq(void);
210 void term_read(void)
211 {
212 ctlseq();
213 while (ptycur < ptylen) {
214 if (!lazy && ptylen - ptycur > 15)
215 lazy_start();
216 ctlseq();
217 }
218 if (lazy)
219 lazy_flush();
220 lazy = 0;
221 }
222
223 static void term_reset(void)
224 {
225 row = col = 0;
226 top = 0;
227 bot = pad_rows();
228 mode = MODE_DEFAULT;
229 fg = FGCOLOR;
230 bg = BGCOLOR;
231 term_blank();
232 }
233
234 static int _openpty(int *master, int *slave)
235 {
236 int unlock = 0;
237 int ptyno = 0;
238 char name[20];
239 if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
240 return -1;
241 if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
242 return -1;
243 if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
244 return -1;
245 sprintf(name, "/dev/pts/%d", ptyno);
246 *slave = open(name, O_RDWR | O_NOCTTY);
247 return 0;
248 }
249
250 static void _login(int fd)
251 {
252 struct winsize winp;
253 winp.ws_col = pad_cols();
254 winp.ws_row = pad_rows();
255 winp.ws_xpixel = 0;
256 winp.ws_ypixel = 0;
257 setsid();
258 ioctl(fd, TIOCSCTTY, NULL);
259 ioctl(fd, TIOCSWINSZ, &winp);
260 dup2(fd, 0);
261 dup2(fd, 1);
262 dup2(fd, 2);
263 if (fd > 2)
264 close(fd);
265 }
266
267 #define MAXENV (1 << 8)
268
269 static void envcpy(char **d, char **s)
270 {
271 while (*s)
272 *d++ = *s++;
273 *d = NULL;
274 }
275
276 static void execvep(char *cmd, char **argv, char **envp)
277 {
278 char path[512];
279 char *p = getenv("PATH");
280 execve(cmd, argv, envp);
281 while (*p) {
282 char *s = path;
283 while (*p && *p != ':')
284 *s++ = *p++;
285 *s++ = '/';
286 strcpy(s, cmd);
287 execve(path, argv, envp);
288 while (*p == ':')
289 p++;
290 }
291 }
292
293 extern char **environ;
294 void term_exec(char *cmd)
295 {
296 int master, slave;
297 memset(term, 0, sizeof(*term));
298 if (_openpty(&master, &slave) == -1)
299 return;
300 if ((term->pid = fork()) == -1)
301 return;
302 if (!term->pid) {
303 char *envp[MAXENV] = {"TERM=linux"};
304 char *argv[2] = {cmd};
305 envcpy(envp + 1, environ);
306 _login(slave);
307 close(master);
308 execvep(cmd, argv, envp);
309 exit(1);
310 }
311 close(slave);
312 term->fd = master;
313 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
314 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
315 term_reset();
316 }
317
318 static void misc_save(struct term_state *state)
319 {
320 state->row = row;
321 state->col = col;
322 state->fg = fg;
323 state->bg = bg;
324 state->mode = mode;
325 }
326
327 static void misc_load(struct term_state *state)
328 {
329 row = state->row;
330 col = state->col;
331 fg = state->fg;
332 bg = state->bg;
333 mode = state->mode;
334 }
335
336 void term_save(struct term *term)
337 {
338 visible = 0;
339 misc_save(&term->cur);
340 term->top = top;
341 term->bot = bot;
342 }
343
344 static void term_redraw(void)
345 {
346 int i;
347 for (i = 0; i < pad_rows(); i++)
348 _draw_row(i);
349 _draw_pos(row, col, 1);
350 }
351
352 void term_load(struct term *t, int flags)
353 {
354 term = t;
355 misc_load(&term->cur);
356 screen = term->screen;
357 fgs = term->fgs;
358 bgs = term->bgs;
359 visible = flags;
360 top = term->top;
361 bot = term->bot;
362 if (flags == TERM_REDRAW) {
363 if (term->fd)
364 term_redraw();
365 else
366 pad_blank(0);
367 }
368 }
369
370 void term_end(void)
371 {
372 if (term->fd)
373 close(term->fd);
374 memset(term, 0, sizeof(*term));
375 term_load(term, visible ? TERM_REDRAW : TERM_HIDDEN);
376 }
377
378 static int writeutf8(char *dst, int c)
379 {
380 char *d = dst;
381 int l;
382 if (!(c & ~0x7f)) {
383 *d++ = c ? c : ' ';
384 return 1;
385 }
386 if (c > 0xffff) {
387 *d++ = 0xf0 | (c >> 18);
388 l = 3;
389 } else if (c > 0x7ff) {
390 *d++ = 0xe0 | (c >> 12);
391 l = 2;
392 } else if (c > 0x7f) {
393 *d++ = 0xc0 | (c >> 6);
394 l = 1;
395 }
396 while (l--)
397 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
398 return d - dst;
399 }
400
401 void term_screenshot(void)
402 {
403 char buf[1 << 11];
404 int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
405 int i, j;
406 for (i = 0; i < pad_rows(); i++) {
407 char *s = buf;
408 for (j = 0; j < pad_cols(); j++)
409 s += writeutf8(s, screen[OFFSET(i, j)]);
410 *s++ = '\n';
411 write(fd, buf, s - buf);
412 }
413 close(fd);
414 }
415
416 /* high-level drawing functions */
417
418 static void empty_rows(int sr, int er)
419 {
420 screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
421 }
422
423 static void blank_rows(int sr, int er)
424 {
425 empty_rows(sr, er);
426 draw_rows(sr, er);
427 draw_cursor(1);
428 }
429
430 static void scroll_screen(int sr, int nr, int n)
431 {
432 draw_cursor(0);
433 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
434 if (n > 0)
435 empty_rows(sr, sr + n);
436 else
437 empty_rows(sr + nr + n, sr + nr);
438 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
439 draw_cursor(1);
440 }
441
442 static void insert_lines(int n)
443 {
444 int sr = MAX(top, row);
445 int nr = bot - row - n;
446 if (nr > 0)
447 scroll_screen(sr, nr, n);
448 }
449
450 static void delete_lines(int n)
451 {
452 int r = MAX(top, row);
453 int sr = r + n;
454 int nr = bot - r - n;
455 if (nr > 0)
456 scroll_screen(sr, nr, -n);
457 }
458
459 static int origin(void)
460 {
461 return mode & MODE_ORIGIN;
462 }
463
464 static void move_cursor(int r, int c)
465 {
466 int t, b;
467 draw_cursor(0);
468 t = origin() ? top : 0;
469 b = origin() ? bot : pad_rows();
470 row = MAX(t, MIN(r, b - 1));
471 col = MAX(0, MIN(c, pad_cols() - 1));
472 draw_cursor(1);
473 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
474 }
475
476 static void set_region(int t, int b)
477 {
478 top = MIN(pad_rows() - 1, MAX(0, t - 1));
479 bot = MIN(pad_rows(), MAX(top + 1, b ? b : pad_rows()));
480 if (origin())
481 move_cursor(top, 0);
482 }
483
484 static void setattr(int m)
485 {
486 switch (m) {
487 case 0:
488 fg = FGCOLOR;
489 bg = BGCOLOR;
490 mode &= ~ATTR_ALL;
491 break;
492 case 1:
493 mode |= ATTR_BOLD;
494 break;
495 case 7:
496 mode |= ATTR_REV;
497 break;
498 case 22:
499 mode &= ~ATTR_BOLD;
500 break;
501 case 27:
502 mode &= ~ATTR_REV;
503 break;
504 default:
505 if ((m / 10) == 3)
506 fg = m > 37 ? FGCOLOR : m - 30;
507 if ((m / 10) == 4)
508 bg = m > 47 ? BGCOLOR : m - 40;
509 }
510 }
511
512 static void kill_chars(int sc, int ec)
513 {
514 int i;
515 for (i = sc; i < ec; i++)
516 draw_char(' ', row, i);
517 draw_cursor(1);
518 }
519
520 static void move_chars(int sc, int nc, int n)
521 {
522 draw_cursor(0);
523 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
524 if (n > 0)
525 screen_reset(OFFSET(row, sc), n);
526 else
527 screen_reset(OFFSET(row, pad_cols() + n), -n);
528 draw_cols(row, MIN(sc, sc + n), pad_cols());
529 draw_cursor(1);
530 }
531
532 static void delete_chars(int n)
533 {
534 int sc = col + n;
535 int nc = pad_cols() - sc;
536 move_chars(sc, nc, -n);
537 }
538
539 static void insert_chars(int n)
540 {
541 int nc = pad_cols() - col - n;
542 move_chars(col, nc, n);
543 }
544
545 static void advance(int dr, int dc, int scrl)
546 {
547 int r = row + dr;
548 int c = col + dc;
549 if (dr && r >= bot && scrl) {
550 int n = bot - r - 1;
551 int nr = (bot - top) + n;
552 scroll_screen(top + -n, nr, n);
553 }
554 if (dr && r < top && scrl) {
555 int n = top - r;
556 int nr = (bot - top) - n;
557 scroll_screen(top, nr, n);
558 }
559 r = dr ? MIN(bot - 1, MAX(top, r)) : r;
560 c = MIN(pad_cols() - 1, MAX(0, c));
561 move_cursor(r, c);
562 }
563
564 static void insertchar(int c)
565 {
566 int wrapready;
567 if (mode & MODE_WRAPREADY)
568 advance(1, -col, 1);
569 if (mode & MODE_INSERT)
570 insert_chars(1);
571 draw_char(c, row, col);
572 wrapready = col == pad_cols() - 1;
573 advance(0, 1, 1);
574 if (wrapready)
575 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
576 }
577
578
579 /* partial vt102 implementation */
580
581 static void escseq(void);
582 static void escseq_cs(void);
583 static void escseq_g0(void);
584 static void escseq_g1(void);
585 static void escseq_g2(void);
586 static void escseq_g3(void);
587 static void csiseq(void);
588 static void csiseq_da(int c);
589 static void csiseq_dsr(int c);
590 static void modeseq(int c, int set);
591
592 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
593
594 static int readutf8(int c)
595 {
596 int result;
597 int l = 1;
598 if (~c & 0xc0)
599 return c;
600 while (l < 6 && c & (0x40 >> l))
601 l++;
602 result = (0x3f >> l) & c;
603 while (l--)
604 result = (result << 6) | (readpty() & 0x3f);
605 return result;
606 }
607
608 #define unknown(ctl, c)
609
610 /* control sequences */
611 static void ctlseq(void)
612 {
613 int c = readpty();
614 switch (c) {
615 case 0x09: /* HT horizontal tab to next tab stop */
616 advance(0, 8 - col % 8, 0);
617 break;
618 case 0x0a: /* LF line feed */
619 case 0x0b: /* VT line feed */
620 case 0x0c: /* FF line feed */
621 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
622 break;
623 case 0x08: /* BS backspace one column */
624 advance(0, -1, 0);
625 break;
626 case 0x1b: /* ESC start escape sequence */
627 escseq();
628 break;
629 case 0x0d: /* CR carriage return */
630 advance(0, -col, 0);
631 break;
632 case 0x00: /* NUL ignored */
633 case 0x07: /* BEL beep */
634 case 0x7f: /* DEL ignored */
635 break;
636 case 0x05: /* ENQ trigger answerback message */
637 case 0x0e: /* SO activate G1 character set & newline */
638 case 0x0f: /* SI activate G0 character set */
639 case 0x11: /* XON resume transmission */
640 case 0x13: /* XOFF stop transmission, ignore characters */
641 case 0x18: /* CAN interrupt escape sequence */
642 case 0x1a: /* SUB interrupt escape sequence */
643 case 0x9b: /* CSI equivalent to ESC [ */
644 unknown("ctlseq", c);
645 break;
646 default:
647 insertchar(readutf8(c));
648 break;
649 }
650 }
651
652 #define ESCM(c) (((c) & 0xf0) == 0x20)
653 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
654
655 /* escape sequences */
656 static void escseq(void)
657 {
658 int c = readpty();
659 while (ESCM(c))
660 c = readpty();
661 switch (c) {
662 case '[': /* CSI control sequence introducer */
663 csiseq();
664 break;
665 case '%': /* CS... escseq_cs table */
666 escseq_cs();
667 break;
668 case '(': /* G0... escseq_g0 table */
669 escseq_g0();
670 break;
671 case ')': /* G1... escseq_g1 table */
672 escseq_g1();
673 break;
674 case '*': /* G2... escseq_g2 table */
675 escseq_g2();
676 break;
677 case '+': /* G3... escseq_g3 table */
678 escseq_g3();
679 break;
680 case '7': /* DECSC save state (position, charset, attributes) */
681 misc_save(&term->sav);
682 break;
683 case '8': /* DECRC restore most recently saved state */
684 misc_load(&term->sav);
685 break;
686 case 'M': /* RI reverse line feed */
687 advance(-1, 0, 1);
688 break;
689 case 'D': /* IND line feed */
690 advance(1, 0, 1);
691 break;
692 case 'E': /* NEL newline */
693 advance(1, -col, 1);
694 break;
695 case 'c': /* RIS reset */
696 term_reset();
697 break;
698 case 'H': /* HTS set tab stop at current column */
699 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
700 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
701 case '>': /* DECPNM set numeric keypad mode */
702 case '=': /* DECPAM set application keypad mode */
703 case 'N': /* SS2 select G2 charset for next char only */
704 case 'O': /* SS3 select G3 charset for next char only */
705 case 'P': /* DCS device control string (ended by ST) */
706 case 'X': /* SOS start of string */
707 case '^': /* PM privacy message (ended by ST) */
708 case '_': /* APC application program command (ended by ST) */
709 case '\\': /* ST string terminator */
710 case 'n': /* LS2 invoke G2 charset */
711 case 'o': /* LS3 invoke G3 charset */
712 case '|': /* LS3R invoke G3 charset as GR */
713 case '}': /* LS2R invoke G2 charset as GR */
714 case '~': /* LS1R invoke G1 charset as GR */
715 case ']': /* OSC operating system command */
716 case 'g': /* BEL alternate BEL */
717 default:
718 unknown("escseq", c);
719 break;
720 }
721 }
722
723 static void escseq_cs(void)
724 {
725 int c = readpty();
726 switch (c) {
727 case '@': /* CSDFL select default charset (ISO646/8859-1) */
728 case 'G': /* CSUTF8 select UTF-8 */
729 case '8': /* CSUTF8 select UTF-8 (obsolete) */
730 default:
731 unknown("escseq_cs", c);
732 break;
733 }
734 }
735
736 static void escseq_g0(void)
737 {
738 int c = readpty();
739 switch (c) {
740 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
741 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
742 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
743 case 'K': /* G0USR G0 charset = user defined mapping */
744 case 'B': /* G0TXT G0 charset = ASCII mapping */
745 default:
746 unknown("escseq_g0", c);
747 break;
748 }
749 }
750
751 static void escseq_g1(void)
752 {
753 int c = readpty();
754 switch (c) {
755 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
756 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
757 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
758 case 'K': /* G1USR G1 charset = user defined mapping */
759 case 'B': /* G1TXT G1 charset = ASCII mapping */
760 default:
761 unknown("escseq_g1", c);
762 break;
763 }
764 }
765
766 static void escseq_g2(void)
767 {
768 int c = readpty();
769 switch (c) {
770 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
771 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
772 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
773 case 'K': /* G2USR G2 charset = user defined mapping */
774 default:
775 unknown("escseq_g2", c);
776 break;
777 }
778 }
779
780 static void escseq_g3(void)
781 {
782 int c = readpty();
783 switch (c) {
784 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
785 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
786 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
787 case 'K': /* G3USR G3 charset = user defined mapping */
788 default:
789 unknown("escseq_g3", c);
790 break;
791 }
792 }
793
794 static int absrow(int r)
795 {
796 return origin() ? top + r : r;
797 }
798
799 #define CSIP(c) (((c) & 0xf0) == 0x30)
800 #define CSII(c) (((c) & 0xf0) == 0x20)
801 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
802
803 #define MAXCSIARGS 32
804 /* ECMA-48 CSI sequences */
805 static void csiseq(void)
806 {
807 int args[MAXCSIARGS] = {0};
808 int i;
809 int n = 0;
810 int c = readpty();
811 int priv = 0;
812
813 if (strchr("<=>?", c)) {
814 priv = c;
815 c = readpty();
816 }
817 while (CSIP(c)) {
818 int arg = 0;
819 while (isdigit(c)) {
820 arg = arg * 10 + (c - '0');
821 c = readpty();
822 }
823 if (c == ';')
824 c = readpty();
825 args[n] = arg;
826 n = n < ARRAY_SIZE(args) ? n + 1 : 0;
827 }
828 while (CSII(c))
829 c = readpty();
830 switch (c) {
831 case 'H': /* CUP move cursor to row, column */
832 case 'f': /* HVP move cursor to row, column */
833 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
834 break;
835 case 'J': /* ED erase display */
836 switch (args[0]) {
837 case 0:
838 kill_chars(col, pad_cols());
839 blank_rows(row + 1, pad_rows());
840 break;
841 case 1:
842 kill_chars(0, col + 1);
843 blank_rows(0, row - 1);
844 break;
845 case 2:
846 term_blank();
847 break;
848 }
849 break;
850 case 'A': /* CUU move cursor up */
851 advance(-MAX(1, args[0]), 0, 0);
852 break;
853 case 'e': /* VPR move cursor down */
854 case 'B': /* CUD move cursor down */
855 advance(MAX(1, args[0]), 0, 0);
856 break;
857 case 'a': /* HPR move cursor right */
858 case 'C': /* CUF move cursor right */
859 advance(0, MAX(1, args[0]), 0);
860 break;
861 case 'D': /* CUB move cursor left */
862 advance(0, -MAX(1, args[0]), 0);
863 break;
864 case 'K': /* EL erase line */
865 switch (args[0]) {
866 case 0:
867 kill_chars(col, pad_cols());
868 break;
869 case 1:
870 kill_chars(0, col + 1);
871 break;
872 case 2:
873 kill_chars(0, pad_cols());
874 break;
875 }
876 break;
877 case 'L': /* IL insert blank lines */
878 if (row >= top && row < bot)
879 insert_lines(MAX(1, args[0]));
880 break;
881 case 'M': /* DL delete lines */
882 if (row >= top && row < bot)
883 delete_lines(MAX(1, args[0]));
884 break;
885 case 'd': /* VPA move to row (current column) */
886 move_cursor(absrow(MAX(1, args[0]) - 1), col);
887 break;
888 case 'm': /* SGR set graphic rendition */
889 if (!n)
890 setattr(0);
891 for (i = 0; i < n; i++)
892 setattr(args[i]);
893 break;
894 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
895 set_region(args[0], args[1]);
896 break;
897 case 'c': /* DA return ESC [ ? 6 c (VT102) */
898 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
899 break;
900 case 'h': /* SM set mode */
901 for (i = 0; i < n; i++)
902 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
903 break;
904 case 'l': /* RM reset mode */
905 for (i = 0; i < n; i++)
906 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
907 break;
908 case 'P': /* DCH delete characters on current line */
909 delete_chars(MIN(MAX(1, args[0]), pad_cols() - col));
910 break;
911 case '@': /* ICH insert blank characters */
912 insert_chars(MAX(1, args[0]));
913 break;
914 case 'n': /* DSR device status report */
915 csiseq_dsr(args[0]);
916 break;
917 case 'G': /* CHA move cursor to column in current row */
918 advance(0, MAX(0, args[0] - 1) - col, 0);
919 break;
920 case 'X': /* ECH erase characters on current line */
921 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
922 break;
923 case '[': /* IGN ignored control sequence */
924 case 'E': /* CNL move cursor down and to column 1 */
925 case 'F': /* CPL move cursor up and to column 1 */
926 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
927 case 'q': /* DECLL set keyboard LEDs */
928 case 's': /* CUPSV save cursor position */
929 case 'u': /* CUPRS restore cursor position */
930 case '`': /* HPA move cursor to column in current row */
931 default:
932 unknown("csiseq", c);
933 break;
934 }
935 }
936
937 static void csiseq_da(int c)
938 {
939 switch (c) {
940 case 0x00:
941 term_sendstr("\x1b[?6c");
942 break;
943 default:
944 /* we don't care much about cursor shape */
945 /* printf("csiseq_da <0x%x>\n", c); */
946 break;
947 }
948 }
949
950 static void csiseq_dsr(int c)
951 {
952 char status[1 << 5];
953 switch (c) {
954 case 0x05:
955 term_sendstr("\x1b[0n");
956 break;
957 case 0x06:
958 sprintf(status, "\x1b[%d;%dR",
959 (origin() ? row - top : row) + 1, col + 1);
960 term_sendstr(status);
961 break;
962 default:
963 unknown("csiseq_dsr", c);
964 break;
965 }
966 }
967
968 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
969 static void modeseq(int c, int set)
970 {
971 switch (c) {
972 case 0x87: /* DECAWM Auto Wrap */
973 mode = BIT_SET(mode, MODE_WRAP, set);
974 break;
975 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
976 mode = BIT_SET(mode, MODE_CURSOR, set);
977 break;
978 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
979 mode = BIT_SET(mode, MODE_ORIGIN, set);
980 break;
981 case 0x14: /* LNM Line Feed / New Line Mode */
982 mode = BIT_SET(mode, MODE_AUTOCR, set);
983 break;
984 case 0x04: /* IRM insertion/replacement mode (always reset) */
985 mode = BIT_SET(mode, MODE_INSERT, set);
986 break;
987 case 0x00: /* IGN Error (Ignored) */
988 case 0x01: /* GATM guarded-area transfer mode (ignored) */
989 case 0x02: /* KAM keyboard action mode (always reset) */
990 case 0x03: /* CRM control representation mode (always reset) */
991 case 0x05: /* SRTM status-reporting transfer mode */
992 case 0x06: /* ERM erasure mode (always set) */
993 case 0x07: /* VEM vertical editing mode (ignored) */
994 case 0x0a: /* HEM horizontal editing mode */
995 case 0x0b: /* PUM positioning unit mode */
996 case 0x0c: /* SRM send/receive mode (echo on/off) */
997 case 0x0d: /* FEAM format effector action mode */
998 case 0x0e: /* FETM format effector transfer mode */
999 case 0x0f: /* MATM multiple area transfer mode */
1000 case 0x10: /* TTM transfer termination mode */
1001 case 0x11: /* SATM selected area transfer mode */
1002 case 0x12: /* TSM tabulation stop mode */
1003 case 0x13: /* EBM editing boundary mode */
1004 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1005 case 0x80: /* IGN Error (Ignored) */
1006 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1007 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1008 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1009 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1010 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1011 case 0x88: /* DECARM Auto Repeat */
1012 case 0x89: /* DECINLM Interlace */
1013 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1014 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1015 default:
1016 unknown("modeseq", c);
1017 break;
1018 }
1019 }
A small linux framebuffer virtual terminal